![Guy Harris](/assets/img/avatar_default.png)
Use WTAP_MAX_PACKET_SIZE_STANDARD, set to 256KB, for everything except for D-Bus captures. Use WTAP_MAX_PACKET_SIZE_DBUS, set to 128MB, for them, because that's the largest possible D-Bus message size. See https://bugs.freedesktop.org/show_bug.cgi?id=100220 for an example of the problems caused by limiting the snapshot length to 256KB for D-Bus. Have a snapshot length of 0 in a capture_file structure mean "there is no snapshot length for the file"; we don't need the has_snap field in that case, a value of 0 mean "no, we don't have a snapshot length". In dumpcap, start out with a pipe buffer size of 2KB, and grow it as necessary. When checking for a too-big packet from a pipe, check against the appropriate maximum - 128MB for DLT_DBUS, 256KB for everything else. Change-Id: Ib2ce7a0cf37b971fbc0318024fd011e18add8b20 Reviewed-on: https://code.wireshark.org/review/21952 Petri-Dish: Guy Harris <guy@alum.mit.edu> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Guy Harris <guy@alum.mit.edu>
463 lines
15 KiB
C
463 lines
15 KiB
C
/* btsnoop.c
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <errno.h>
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#include <string.h>
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#include "wtap-int.h"
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#include "file_wrappers.h"
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#include "btsnoop.h"
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/*
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* Symbian's btsnoop format is derived from Sun's snoop format.
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* See RFC 1761 for a description of the "snoop" file format.
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*/
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/* Magic number in "btsnoop" files. */
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static const char btsnoop_magic[] = {
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'b', 't', 's', 'n', 'o', 'o', 'p', '\0'
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};
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/* "btsnoop" file header (minus magic number). */
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struct btsnoop_hdr {
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guint32 version; /* version number (should be 1) */
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guint32 datalink; /* datalink type */
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};
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/* "btsnoop" record header. */
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struct btsnooprec_hdr {
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guint32 orig_len; /* actual length of packet */
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guint32 incl_len; /* number of octets captured in file */
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guint32 flags; /* packet flags */
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guint32 cum_drops; /* cumulative number of dropped packets */
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gint64 ts_usec; /* timestamp microseconds */
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};
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/* H1 is unframed data with the packet type encoded in the flags field of capture header */
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/* It can be used for any datalink by placing logging above the datalink layer of HCI */
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#define KHciLoggerDatalinkTypeH1 1001
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/* H4 is the serial HCI with packet type encoded in the first byte of each packet */
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#define KHciLoggerDatalinkTypeH4 1002
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/* CSR's PPP derived bluecore serial protocol - in practice we log in H1 format after deframing */
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#define KHciLoggerDatalinkTypeBCSP 1003
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/* H5 is the official three wire serial protocol derived from BCSP*/
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#define KHciLoggerDatalinkTypeH5 1004
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/* Linux Monitor */
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#define KHciLoggerDatalinkLinuxMonitor 2001
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/* BlueZ 5 Simulator */
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#define KHciLoggerDatalinkBlueZ5Simulator 2002
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#define KHciLoggerHostToController 0
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#define KHciLoggerControllerToHost 0x00000001
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#define KHciLoggerACLDataFrame 0
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#define KHciLoggerCommandOrEvent 0x00000002
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static const gint64 KUnixTimeBase = G_GINT64_CONSTANT(0x00dcddb30f2f8000); /* offset from symbian - unix time */
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static gboolean btsnoop_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset);
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static gboolean btsnoop_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
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static gboolean btsnoop_read_record(wtap *wth, FILE_T fh,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
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wtap_open_return_val btsnoop_open(wtap *wth, int *err, gchar **err_info)
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{
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char magic[sizeof btsnoop_magic];
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struct btsnoop_hdr hdr;
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int file_encap=WTAP_ENCAP_UNKNOWN;
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/* Read in the string that should be at the start of a "btsnoop" file */
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if (!wtap_read_bytes(wth->fh, magic, sizeof magic, err, err_info)) {
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if (*err != WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_ERROR;
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return WTAP_OPEN_NOT_MINE;
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}
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if (memcmp(magic, btsnoop_magic, sizeof btsnoop_magic) != 0) {
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return WTAP_OPEN_NOT_MINE;
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}
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/* Read the rest of the header. */
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if (!wtap_read_bytes(wth->fh, &hdr, sizeof hdr, err, err_info))
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return WTAP_OPEN_ERROR;
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/*
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* Make sure it's a version we support.
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*/
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hdr.version = g_ntohl(hdr.version);
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if (hdr.version != 1) {
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup_printf("btsnoop: version %u unsupported", hdr.version);
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return WTAP_OPEN_ERROR;
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}
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hdr.datalink = g_ntohl(hdr.datalink);
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switch (hdr.datalink) {
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case KHciLoggerDatalinkTypeH1:
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file_encap=WTAP_ENCAP_BLUETOOTH_HCI;
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break;
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case KHciLoggerDatalinkTypeH4:
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file_encap=WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR;
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break;
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case KHciLoggerDatalinkTypeBCSP:
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("btsnoop: BCSP capture logs unsupported");
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return WTAP_OPEN_ERROR;
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case KHciLoggerDatalinkTypeH5:
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("btsnoop: H5 capture logs unsupported");
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return WTAP_OPEN_ERROR;
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case KHciLoggerDatalinkLinuxMonitor:
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file_encap=WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR;
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break;
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case KHciLoggerDatalinkBlueZ5Simulator:
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup("btsnoop: BlueZ 5 Simulator capture logs unsupported");
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return WTAP_OPEN_ERROR;
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default:
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*err = WTAP_ERR_UNSUPPORTED;
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*err_info = g_strdup_printf("btsnoop: datalink type %u unknown or unsupported", hdr.datalink);
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return WTAP_OPEN_ERROR;
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}
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wth->subtype_read = btsnoop_read;
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wth->subtype_seek_read = btsnoop_seek_read;
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wth->file_encap = file_encap;
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wth->snapshot_length = 0; /* not available in header */
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wth->file_tsprec = WTAP_TSPREC_USEC;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_BTSNOOP;
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return WTAP_OPEN_MINE;
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}
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static gboolean btsnoop_read(wtap *wth, int *err, gchar **err_info,
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gint64 *data_offset)
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{
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*data_offset = file_tell(wth->fh);
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return btsnoop_read_record(wth, wth->fh, &wth->phdr, wth->frame_buffer,
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err, err_info);
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}
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static gboolean btsnoop_seek_read(wtap *wth, gint64 seek_off,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
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{
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
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return FALSE;
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return btsnoop_read_record(wth, wth->random_fh, phdr, buf, err, err_info);
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}
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static gboolean btsnoop_read_record(wtap *wth, FILE_T fh,
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struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
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{
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struct btsnooprec_hdr hdr;
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guint32 packet_size;
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guint32 flags;
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guint32 orig_size;
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gint64 ts;
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/* Read record header. */
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if (!wtap_read_bytes_or_eof(fh, &hdr, sizeof hdr, err, err_info))
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return FALSE;
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packet_size = g_ntohl(hdr.incl_len);
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orig_size = g_ntohl(hdr.orig_len);
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flags = g_ntohl(hdr.flags);
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if (packet_size > WTAP_MAX_PACKET_SIZE_STANDARD) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("btsnoop: File has %u-byte packet, bigger than maximum of %u",
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packet_size, WTAP_MAX_PACKET_SIZE_STANDARD);
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return FALSE;
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}
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ts = GINT64_FROM_BE(hdr.ts_usec);
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ts -= KUnixTimeBase;
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phdr->rec_type = REC_TYPE_PACKET;
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phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
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phdr->ts.secs = (guint)(ts / 1000000);
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phdr->ts.nsecs = (guint)((ts % 1000000) * 1000);
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phdr->caplen = packet_size;
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phdr->len = orig_size;
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if(wth->file_encap == WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR)
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{
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phdr->pseudo_header.p2p.sent = (flags & KHciLoggerControllerToHost) ? FALSE : TRUE;
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} else if(wth->file_encap == WTAP_ENCAP_BLUETOOTH_HCI) {
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phdr->pseudo_header.bthci.sent = (flags & KHciLoggerControllerToHost) ? FALSE : TRUE;
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if(flags & KHciLoggerCommandOrEvent)
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{
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if(phdr->pseudo_header.bthci.sent)
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{
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phdr->pseudo_header.bthci.channel = BTHCI_CHANNEL_COMMAND;
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}
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else
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{
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phdr->pseudo_header.bthci.channel = BTHCI_CHANNEL_EVENT;
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}
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}
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else
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{
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phdr->pseudo_header.bthci.channel = BTHCI_CHANNEL_ACL;
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}
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} else if (wth->file_encap == WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR) {
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phdr->pseudo_header.btmon.opcode = flags & 0xFFFF;
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phdr->pseudo_header.btmon.adapter_id = flags >> 16;
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}
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/* Read packet data. */
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return wtap_read_packet_bytes(fh, buf, phdr->caplen, err, err_info);
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}
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/* Returns 0 if we could write the specified encapsulation type,
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an error indication otherwise. */
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int btsnoop_dump_can_write_encap(int encap)
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{
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/* Per-packet encapsulations aren't supported. */
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if (encap == WTAP_ENCAP_PER_PACKET)
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return WTAP_ERR_ENCAP_PER_PACKET_UNSUPPORTED;
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/* XXX - for now we only support WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR and WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR */
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if (encap != WTAP_ENCAP_BLUETOOTH_H4_WITH_PHDR && encap != WTAP_ENCAP_BLUETOOTH_LINUX_MONITOR)
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return WTAP_ERR_UNWRITABLE_ENCAP;
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return 0;
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}
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struct hci_flags_mapping
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{
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guint8 hci_type;
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guint8 sent;
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guint8 flags;
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};
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static const struct hci_flags_mapping hci_flags[] =
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{
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{ 0x02, TRUE, KHciLoggerHostToController|KHciLoggerACLDataFrame }, /* HCI_H4_TYPE_ACL */
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{ 0x02, FALSE, KHciLoggerControllerToHost|KHciLoggerACLDataFrame }, /* HCI_H4_TYPE_ACL */
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{ 0x01, TRUE, KHciLoggerHostToController|KHciLoggerCommandOrEvent }, /* HCI_H4_TYPE_CMD */
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{ 0x04, FALSE, KHciLoggerControllerToHost|KHciLoggerCommandOrEvent }, /* HCI_H4_TYPE_EVT */
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};
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static guint8 btsnoop_lookup_flags(guint8 hci_type, gboolean sent, guint8 *flags)
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{
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guint8 i;
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for (i=0; i < G_N_ELEMENTS(hci_flags); ++i)
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{
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if (hci_flags[i].hci_type == hci_type &&
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hci_flags[i].sent == sent)
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{
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*flags = hci_flags[i].flags;
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return TRUE;
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}
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}
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return FALSE;
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}
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static gboolean btsnoop_format_partial_rec_hdr(
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const struct wtap_pkthdr *phdr,
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const union wtap_pseudo_header *pseudo_header,
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const guint8 *pd, int *err, gchar **err_info,
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struct btsnooprec_hdr *rec_hdr)
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{
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gint64 ts_usec;
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gint64 nsecs;
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guint8 flags = 0;
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if (!btsnoop_lookup_flags(*pd, pseudo_header->p2p.sent, &flags)) {
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*err = WTAP_ERR_UNWRITABLE_REC_DATA;
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*err_info = g_strdup_printf("btsnoop: hci_type 0x%02x for %s data isn't supported",
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*pd,
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pseudo_header->p2p.sent ? "sent" : "received");
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return FALSE;
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}
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nsecs = phdr->ts.nsecs;
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ts_usec = ((gint64) phdr->ts.secs * 1000000) + (nsecs / 1000);
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ts_usec += KUnixTimeBase;
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rec_hdr->flags = GUINT32_TO_BE(flags);
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rec_hdr->cum_drops = GUINT32_TO_BE(0);
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rec_hdr->ts_usec = GINT64_TO_BE(ts_usec);
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return TRUE;
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}
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/* FIXME: How do we support multiple backends?*/
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static gboolean btsnoop_dump_h1(wtap_dumper *wdh,
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const struct wtap_pkthdr *phdr,
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const guint8 *pd, int *err, gchar **err_info)
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{
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const union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
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struct btsnooprec_hdr rec_hdr;
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/* We can only write packet records. */
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if (phdr->rec_type != REC_TYPE_PACKET) {
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*err = WTAP_ERR_UNWRITABLE_REC_TYPE;
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return FALSE;
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}
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/*
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* Don't write out anything bigger than we can read.
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* (This will also fail on a caplen of 0, as it should.)
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*/
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if (phdr->caplen-1 > WTAP_MAX_PACKET_SIZE_STANDARD) {
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*err = WTAP_ERR_PACKET_TOO_LARGE;
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return FALSE;
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}
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if (!btsnoop_format_partial_rec_hdr(phdr, pseudo_header, pd, err, err_info,
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&rec_hdr))
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return FALSE;
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rec_hdr.incl_len = GUINT32_TO_BE(phdr->caplen-1);
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rec_hdr.orig_len = GUINT32_TO_BE(phdr->len-1);
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if (!wtap_dump_file_write(wdh, &rec_hdr, sizeof rec_hdr, err))
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return FALSE;
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wdh->bytes_dumped += sizeof rec_hdr;
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/* Skip HCI packet type */
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++pd;
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if (!wtap_dump_file_write(wdh, pd, phdr->caplen-1, err))
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return FALSE;
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wdh->bytes_dumped += phdr->caplen-1;
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return TRUE;
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}
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static gboolean btsnoop_dump_h4(wtap_dumper *wdh,
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const struct wtap_pkthdr *phdr,
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const guint8 *pd, int *err, gchar **err_info)
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{
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const union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
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struct btsnooprec_hdr rec_hdr;
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/* We can only write packet records. */
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if (phdr->rec_type != REC_TYPE_PACKET) {
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*err = WTAP_ERR_UNWRITABLE_REC_TYPE;
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return FALSE;
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}
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/* Don't write out anything bigger than we can read. */
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if (phdr->caplen > WTAP_MAX_PACKET_SIZE_STANDARD) {
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*err = WTAP_ERR_PACKET_TOO_LARGE;
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return FALSE;
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}
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if (!btsnoop_format_partial_rec_hdr(phdr, pseudo_header, pd, err, err_info,
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&rec_hdr))
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return FALSE;
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rec_hdr.incl_len = GUINT32_TO_BE(phdr->caplen);
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rec_hdr.orig_len = GUINT32_TO_BE(phdr->len);
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if (!wtap_dump_file_write(wdh, &rec_hdr, sizeof rec_hdr, err))
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return FALSE;
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wdh->bytes_dumped += sizeof rec_hdr;
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if (!wtap_dump_file_write(wdh, pd, phdr->caplen, err))
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return FALSE;
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wdh->bytes_dumped += phdr->caplen;
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return TRUE;
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}
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/* FIXME: How do we support multiple backends?*/
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gboolean btsnoop_dump_open_h1(wtap_dumper *wdh, int *err)
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{
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struct btsnoop_hdr file_hdr;
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/* This is a btsnoop file */
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wdh->subtype_write = btsnoop_dump_h1;
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/* Write the file header. */
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if (!wtap_dump_file_write(wdh, btsnoop_magic, sizeof btsnoop_magic, err))
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return FALSE;
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wdh->bytes_dumped += sizeof btsnoop_magic;
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/* current "btsnoop" format is 1 */
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file_hdr.version = GUINT32_TO_BE(1);
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/* HCI type encoded in first byte */
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file_hdr.datalink = GUINT32_TO_BE(KHciLoggerDatalinkTypeH1);
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if (!wtap_dump_file_write(wdh, &file_hdr, sizeof file_hdr, err))
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return FALSE;
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wdh->bytes_dumped += sizeof file_hdr;
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return TRUE;
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}
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/* Returns TRUE on success, FALSE on failure; sets "*err" to an error code on
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failure */
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gboolean btsnoop_dump_open_h4(wtap_dumper *wdh, int *err)
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{
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struct btsnoop_hdr file_hdr;
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/* This is a btsnoop file */
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wdh->subtype_write = btsnoop_dump_h4;
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/* Write the file header. */
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if (!wtap_dump_file_write(wdh, btsnoop_magic, sizeof btsnoop_magic, err))
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return FALSE;
|
|
|
|
wdh->bytes_dumped += sizeof btsnoop_magic;
|
|
|
|
/* current "btsnoop" format is 1 */
|
|
file_hdr.version = GUINT32_TO_BE(1);
|
|
/* HCI type encoded in first byte */
|
|
file_hdr.datalink = GUINT32_TO_BE(KHciLoggerDatalinkTypeH4);
|
|
|
|
if (!wtap_dump_file_write(wdh, &file_hdr, sizeof file_hdr, err))
|
|
return FALSE;
|
|
|
|
wdh->bytes_dumped += sizeof file_hdr;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|